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Title: Sonic Nozzle Proving Of Large Volume MetersAuthor: Warren C. MorrisSource: American Gas Association 1980Year Published: 1980Abstract: Sonic nozzle proving is a new concept for the gas industry to be used for either shop or field proving of the larger volume sized meters. It enables the operator to prove meters at varying pressure settings and with greater flow capacity than in the past, but still be able to obtain the high degree of accuracy of the old bell prover system. Combine this with the modern-day microprocessor, the computer on a chip, and the old proving problems of the past, such as pulsating pressures caused by the prover meters, changing temperature readings of glass thermometers, and the greatest problem of all, human errors, no longer have any effect on the meter accuracy proof curves.